I bought some wine juice and put in a 5 gallon carboy after primary fermentation, but the carboy is only about 4/5 or so full.
I asked the winemaker and was suggested that I add water to the juice to fill the carboy to the top, but I fear that adding 20% water would make the final wine taste really watered-down.
If I were to add something to the juice, what can I add to fill it to the top? Can I add some fruit juice (extracted from real fruits), for example?
I guess another option is to get a smaller carboy, if I can find one. Is there somewhere in Toronto I can get a smaller carboy? however I wonder if I can actually find a carboy that's just the right size.